Steam boiler



I March 17, 1931. D, S J ACOBUS 1,796,713

STEAM BOILER Original Filed March 5, 1923 JIIIIIII- w ww INVENTOR ATTORNEYS Patented Mar. 17, 1931 UNITED .STATES PATENT OFFICE 4 DAVID S. IACOIBUS, OF MONTGLAIB, NEW JERSEY, ASSIGNOR TO THE BAIBGOCK 8a 'WTIILGOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY STEAM BOILER Original application filed March 5, 1923,

water takes place by natural circulation.

This is a division of my application Serial No. 622,720, filed March 5, 1923.

The invention will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a fragmentary section illustrating an embodiment of the invention; Fig. 2 is a fragmentary sectional view at right angles to Fig. 1, and Fig. 3

is a fragmentary sectional view illustrating the connections between the lower ends of tubes of one of the boiler sections and a header.

Reference characters and 11 indicate the front and rear walls respectively of the boiler setting, and 12 an intermediate wall that extends across the boiler between the side walls. The roof of the boiler is indicated at 15 and the furnace that may be arranged for burning liquid fuel, for example, is partially indicated at 36.

One section of the boiler that may be called the series section as it is the section through a which water and steam are forced,lis indicated generally in Fig. 1 at A and comprises lower headers 47 to which feed water is delivered'by a supply pipe 48 from a pump (not shown) preferably through an auxiliary header 47, the connection between the auxiliary header 47 and the headers 47 bein made bynipples 47 each one of which is pre erably provided with a ferrule 47 The lower headers 47 are connected. to upper headers 49 by a plurality of tubes 50, the. steam and water passing from the headers 49 to the steam and waterdrum 31 by nipples 51. The circulatory section B of the boiler comprises tubes 41 connecting the drum 40 to the, steam and water drum 31, part of the tubes being located in theflue, while others 41, are located outside of the setting. With the arrangement here shown, the lower ends of the tubes 50 are preferably provided with ferrules 52 in order to equalize the flow of water from the headers 47 to the various .tubes 50 connected thereto. Furthermore,

Serial No. 622,720. Divided and this application filed December 18, 1927. Serial No. 240,382.

the provision of the ferrules increases the reslstance to the flow of the water in the tubes,

which is an advantage in this type of boiler,

thereby preventing local circulation between the tubes of the section. Suflicient resistance to the flow of water may, in this, as in the other illustrative arrangements, however, be produced by using small diameter tubes.

A pipe 42 leads from the steam space of the steam and water dr 31 to the inlet header 43 of a superheater indicated generally at 44, the inlet header being connected by upwardly extending U-tubes 45 to the outlet header 46. The hot gases from the furnace 36 are directed first over the tubes 41, thereby setting up: a circulation in the section B. The gases then pass in succession over the superheater 44 and the series section A. of the boiler. In this arrangement, the temper ature of the gases is lowered by the circulatory section B before they are brought into contact with either the superheater 44 or the 1. A boiler setting having a combustion chamber, means for feeding fuel and air to said combustion chamber, a water tube boiler comprising a plurality of distinct groups of steam generating tubes arranged to be subjected successively to heating gases leaving said combustion chamber, one of said groups within the boiler setting being constructed to produce a natural water circulation therein and including a steam and water separator through which the water of said natural circulating grou is circulated, another of said the first named group relative to gas flow cm the combustion chamber whereby to be contacted with gases from which a portion of their heat has been given up to said first named group, said second named group ,comprising a multiplicity of tubes in parallel having a material y greater equalize the distribution of water in said flow paths, the heat transfer surfaces of the two groups being so related to each other and to heat output from the combustlon' chamber as to insure that the gases entering the second group shall be of such quantity and temperature as to progressively heat the water passing therethrough from 1ts lnlet temperature to its boiling point and then to evaporate a portion thereof, said forced flow group having a water pressure supply to its inlet end for insuring such progressive water flow through the group, steam and water conducting means from the discharge of sa1d forced flow groupto said separator, and a superheater located in the path of gas flow. between said groups of tubes. 7

2. A boiler setting having a combustlon chamber, means for feeding fuel and air to said combustion chamber, a Water tube boiler comprising a plurality of distinct groupsof steam generating tubes arranged to be sub jected successively to heating gases leaving said combustion chamber, one of said groups within the boiler setting being constructed to produce a natural water circulation therein and including a steam and water separator through which the water of said natural circulation group is circulated, another of said groups succeedingthe first named group relative to gas flow from the combustion chamber whereby to be contacted with gases from which a portion of their heat has been given up to said first named group, said second named group comprising a multiplicity of tubes in parallel, having a materially greater heat transfer surface than that of thevfirst group and arranged to provide definitely predetermined flow paths insuring a continuously progressive forced water flow from inlet thereto to discharge therefrom, means to equalize the.

distribution of water in said flow paths, the

heat transfer surfaces of the two groups being so related to each other and to heat output from the combustion chamber as to insure thatthe gases entering the second group shall be'of such quantity and temperature as to progressively heat the water passing therethrough from its inlet temperature to its boiling point and to then evaporate a portion thereof, said forced flow group having a water pressure supply to its inlet end for insuring such progressive water flow through the group, steam and water conducting means 7 from the discharge of said forcedflow group to said separator, all of the water passing into the natural circulation group being received from said pressure supply only after passage through said forced flow group.

3. A boiler setting having a combustion chamber, means for feeding fuel and air to said combustion chamber, a water tube boiler comprising a plurality of distinct groups of steam generating tubes arranged to be subjected successively to heating gases leaving said combustion chamber, one of said groups within the boiler setting being constructed to produce a natural water circulation therein and including a steam and water separator through which the water of said natural circulation group is circulated, another of said groups succeeding the first named group relative to gas flow from the combustion chamber whereby to be contacted with gases from which a portion of their heat has been given up to said first named group, said second named group comprising a multiplicity of tubes in parallel, having a materially greater heat transfer surface than that of the first group and arranged to provide definitely predetermined flow paths insuring a continuously progressive forced water flow from inlet thereto to discharge therefrom, means to equalize the distribution of water in said flow paths, the heat transfer surfaces of the two groups being so related to each other and to heat output from the combustion chamber as to insure that the gases entering the second group shall be of such quantityand temperature as to progressively heat the water passing therethrough from its inlet temperature to its boiling 'point and to then evaporate a portion thereof, said forced flow group having a water pressure supply to its inlet end for insuring such pro gressive water flow through the group, all of the water passing into the natural circulation group bein received from said pressure supply only a ter passage through said forced flow group, and a multiple number of connections from the discharge end of said forced flow group to said steam and water separator.

4. A boiler setting having a. combustion" toproduce a natural water circulation there in, another of said groups succeeding the first named group relative to gas flow from the combustion chamber whereby to be contacted with gases from which a portion of their heat has been given up to said first named group, said second named group having a materially greater heat transfer surface than that of the first group and arranged to provide definitely predetermined flowpaths insuring a continuously progressive forced water'flow from inlet thereto to discharge therefrom, means to equalize the distribution of water in said flow paths, the heat transfer surfaces of the two groups being so related to each other and to heat output from the such quantity and temperature as to progressively heat the water passing therethrough from its inlet temperature to its boiling point and then to evaporate a ortion thereof, said second named group aving a Water pressure supply to its inlet end for insuring a progressive flow through the group, steam and water conducting means between the discharge of said second named group and said natural circulation group 0 and a superheater located in the path of gas flow between said groups of tubes.

DAVID S. JACOBUS. 

